South Australian Gulf

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South Australian Gulf South Australian Gulf 8 South Australian Gulf ................................................. 2 8.5.2 Streamflow volumes ............................. 28 8.1 Introduction ........................................................ 2 8.5.3 Streamflow salinity ................................ 28 8.2 Key information .................................................. 3 8.5.4 Flooding ............................................... 31 8.3 Description of the region .................................... 4 8.5.5 Storage systems ................................... 31 8.3.1 Physiographic characteristics.................. 6 8.5.6 Wetlands .............................................. 31 8.3.2 Elevation ................................................. 7 8.5.7 Hydrogeology ....................................... 35 8.3.3 Slopes .................................................... 8 8.5.8 Water table salinity ................................ 35 8.3.4 Soil types ................................................ 9 8.5.9 Groundwater management units ........... 35 8.3.5 Land use .............................................. 11 8.5.10 Status of selected aquifers .................... 39 8.3.6 Population distribution .......................... 13 8.6 Water for cities and towns ................................ 47 8.3.7 Rainfall zones ....................................... 14 8.6.1 Urban centres ....................................... 47 8.3.8 Rainfall deficit ....................................... 15 8.6.2 Sources of water supply ....................... 49 8.4 Landscape water flows .................................... 16 8.6.3 Adelaide ............................................... 49 8.4.1 Rainfall ................................................. 17 8.7 Water for agriculture ......................................... 55 8.4.2 Evapotranspiration ................................ 20 8.7.1 Soil moisture ......................................... 55 8.4.3 Landscape water yield ......................... 23 8.7.2 Irrigation water ...................................... 56 8.5 Surface water and groundwater ....................... 26 8.7.3 Irrigation areas ...................................... 56 8.5.1 Rivers ................................................... 26 8.7.4 McLaren Vale prescribed wells area ...... 56 South Australian Gulf 8 South Australian Gulf 8.1 Introduction Spatial and temporal patterns in landscape water flows are presented as well as an examination of This chapter examines water resources in the South the surface and groundwater resources. The chapter Australian Gulf region in 2011–12 and over recent concludes with a review of the water situation for decades. It starts with summary information on urban centres and irrigation areas. The data sources the status of water flows, stores and use. This is and methods used in developing the diagrams and followed by descriptive information for the region maps are listed in the Technical Supplement. including the physiographic characteristics, soil types, population, land use and climate. 2 Australian Water Resources Assessment 2012 8.2 Key information Table 8.1 gives an overview of the key components of the data and information in this chapter. Table 8.1 Key information on water flows, stores and use in the South Australian Gulf region Landscape water flows Region average Difference from 1911–2012 Decile ranking with respect to the long-term annual mean 1911–2012 record Rainfall 331 mm +10% 8th —above average Evapo- transpiration 306 mm +7% 8th —above average Landscape water yield 9 mm – 10% 6th—average Streamflow (at selected gauges) Annual total Highly variable pattern of high and low flow in the river gauges in the south eastern flow: rivers Salinity: Annual median electrical conductivity predominantly above 1,000 μS/cm in gauges in the south eastern rivers and on Kangaroo Island Flooding: No major flooding in the monitoring gauges surrounding Adelaide Surface water storage (comprising about 74% of the region’s total capacity of all major storages) Total 30 June 2012 30 June 2011 Change accessible accessible % of total accessible % of total accessible % of total capacity volume capacity volume capacity volume capacity 197 GL 96 GL 49% 135 GL 69% – 39 GL – 20% Groundwater (in selected aquifers) Levels: Variable trends in the different aquifers, predominantly falling in middle aquifers and rising in deeper aquifers Salinity: Saline groundwater (≥3,000 mg/L) throughout most of the region with non-saline (<3,000 mg/L) areas around Adelaide and in the Flinders Ranges Urban water use (Adelaide) Total sourced in 2011–12 Total sourced in Change Restrictions 2010–11 138 GL 125 GL +13 GL (+10%) Water Wise Measures Annual mean soil moisture (model estimates) Spatial patterns: Predominantly average annual mean soil moisture and very much above average soil moisture in the far north Temporal patterns in Average to above average soil moisture throughout the year regional average: Australian Water Resources Assessment 2012 3 South Australian Gulf 8.3 Description of the region Other significant areas of nature conservation occur on Eyre Peninsula, Kangaroo Island, and The South Australian Gulf region extends over through the Mount Lofty and Flinders Ranges. 117,700 km2 of South Australia, surrounding the Gulf Irrigated agriculture is mostly for viticulture and of St Vincent and Spencer Gulf, and stretching inland wine production, the most important of which is 300 km to the north of Spencer Gulf. To the east (at concentrated in the Onkaparinga catchment. Section the border of the Murray–Darling Basin) the region is 8.7 has more information on agricultural activities in bounded by the western slopes of the Mount Lofty the region. and Flinders Ranges; to the north, it is bounded by The region has a Mediterranean climate in the the Lake Eyre Basin; and to the west by the South southeast, and a semi-arid climate inland and to the Western Plateau region. The south of the region north. Rainfall mainly occurs in winter. Spring and includes Kangaroo Island. summer rainfall can be substantial although highly Except for the Flinders Ranges (with a highest peak variable. Subsections 8.3.7 and 8.3.8 provide more of 932 m) and the Mount Lofty Ranges, the region information on the rainfall patterns and deficits across has moderately flat terrain. Subsections 8.3.1–8.3.4 the region. give more detail on the physical characteristics of There are no major permanent freshwater lakes in the region. the South Australian Gulf region. A number of large The South Australian Gulf region has a population in endorheic salt lakes exist in the north, including Lake excess of 1.4 million, or just over 6% of the country’s Torrens, Island Lagoon, Pernatty Lagoon, Lake Hart, total population (Australian Bureau of Statistics [ABS] Lake Gilles and Lake MacFarlane (Figure 8.1). In the 2011b). Major population centres in the region include south, short rivers drain into the ocean. The region Adelaide, Victor Harbour, Port Pirie, Port Augusta, has some important coastal and marine ecosystems. Whyalla and Port Lincoln (Figure 8.1). Further The hydrogeology of the region can be partitioned discussion of the region’s population distribution and into areas of surficial and underlying sediments, urban centres can be found in subsection 8.3.6 and and areas of outcropping fractured rock. Significant section 8.6 respectively. groundwater resources are found in surficial Dryland pasture and cropping are major land uses in sediments and the Quaternary and Tertiary aquifers the region. Grazing is concentrated in the northern that underlie them. Typically fractured rock systems arid river basins such as Lake Torrens, Willochra offer restricted low volume groundwater resources; Creek and Mambray Coast (south of Lake Torrens), however, there are some parts of this region with and the Broughton River basin. Several river basins a greater density of fractures and more substantial (Wakefield, Gawler and Broughton) have 50% or groundwater resource availability. A more detailed more of their area occupied by dryland agriculture. description of the rivers and groundwater status is More than half of the land area devoted to nature given in section 8.5. conservation is a single reserve covering the Lake Torrens salt lake (Figure 8.1). A view of rural Southern Australia looking north towards Flinders Range | Malcolm Watson 4 Australian Water Resources Assessment 2012 Figure 8.1 Major rivers and urban centres in the South Australian Gulf region Australian Water Resources Assessment 2012 5 South Australian Gulf 8.3.1 Physiographic characteristics southeast oriented longitudinal dunes, locally broken by granite hills, ridges of metamorphic rocks and The physiographic map in Figure 8.2 shows areas plains extending as headlands and inlets along the with similar landform evolutionary histories (Pain et southern coast. al. 2011). These can be related back to similar geology The Gulfs Ranges province occupies 57% of the and climatic impacts which define the extent of region and has a complex fold belt of prominent erosion processes. The areas have distinct physical ranges in the north, chiefly quartzite with vales characteristics that can influence hydrological on weaker rocks, and in the southeast stepped processes. The South Australian Gulf region has two fault blocks and islands, mainly of weathered physiographic provinces, namely Eyre Peninsula and metamorphic rocks with ferruginous cappings. In the Gulfs Ranges. northwest, there are dissected sandstone plateaus,
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